Showing variables that are not variables

After running doxygen, a php file with this line of code is shown as a
variable in the documentation.

if($_SESSION['autenticado'] !='validado') {
    header("location: index.php");
    exit;
 }

And the very funny thing, is that the true variable $ menu, in the next line
is set in the same line of the code before.

This is how the documentation is shown.

Variables:

if($_SESSION['autenticado']!='validado')    $menu = new Menu()

Is there any chance to fix this?This has happened in others context too, I
suppose the same problem happening.

I'm using the last version 1.8.15, but the problem also has occurred in
version 1.8.11




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